feat(api): add AI text-to-deck generation, wallet deposit structure, and profile/notification endpoints

Fills the gaps between the admin panel screens and the backend: a full
free-text + slide-count + language -> AI-generated presentation flow with
new slide-cloning logic in TemplateFillService, a "my presentations" list
endpoint, a swappable payment-gateway structure for wallet top-ups (fake
driver for now), and avatar upload / public-profile toggle / account
deletion / password change / notification preference endpoints.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

app/Models/Wallet.php

@@ -26,6 +26,14 @@ class Wallet extends Model
         return $this->hasMany(WalletTransaction::class)->latest();
     }
 
+    /**
+     * @return HasMany<WalletDeposit, $this>
+     */
+    public function deposits(): HasMany
+    {
+        return $this->hasMany(WalletDeposit::class)->latest();
+    }
+
     /**
      * @return array<string, string>
      */